Normally I have different amounts of different currencies on lots of different sites (e.g. BTC/LTC on BTC-e, BTC on Havelock Investments, BTC/LTC pool earnings, NMC on Vircurex, BTC/LTC/NMC on my own sites, ...), so I made a site that keeps track of how much is on which site, and compiles summary reports. It's so useful that we've developed it into a real site for the cryptocurrency professional: CryptFolio.

Thanks for all your feedback! I'll be pushing out an update over the weekend including: Feathercoin support; will look into adding cryptostocks.com, flexcoin.com, Bitfunder, a bunch of LTC mining pools; and clean up some errors.

@icoin: Piwik.org is a web analytics package..?

CryptFolio lets you keep track of your cryptocurrencies (BTC/LTC/NMC/FTC/XPM/DOGE/...), investments, securities and miners using public addresses and read-only APIs. https://cryptfolio.com

I tried to add Bitfunder last week, but their API is still unreleased/in private beta. I asked for an update but no response yet. Hopefully it's out soon; you could also post there and ask them nicely to release it sooner.

CryptFolio lets you keep track of your cryptocurrencies (BTC/LTC/NMC/FTC/XPM/DOGE/...), investments, securities and miners using public addresses and read-only APIs. https://cryptfolio.com